I guess a picture is worth a thousand word <img src="/images/graemlins/smirk.gif" alt="" />. Here is a picture of both the LM Charge and Wave.
The red arrow points at the swivel mechanism (metal disk) of the Wave. The blue arrow points at the swivel mechanism of the charge. One is build into the the handle (charge) and the other is a not (wave).
That is why I ask if any Wave owner had problems with that disk loosening up or bending if you tried to pry something with the blade or by applying too much pressure on the metal file while filing something.
Stefan